Energy harvesting device and photovoltaic power system

Abstract

The application belongs to the field of photovoltaic power generation, and particularly relates to an energy collecting device and a photovoltaic power generation system. The energy collecting device is arranged at the connection between a steel cable of a flexible photovoltaic support and a stand. When the steel cable produces severe vibration, the vibration is transmitted to the vicinity of the stand. At this time, the active ring-shaped magnet vibrates with the steel cable. When the active ring-shaped magnet vibrates in different directions, the passive ring-shaped magnet inside the piezoelectric sleeve in the direction is approached, and repulsion force is generated, so that the piezoelectric film layer continuously deforms. The mechanical energy is converted into electric energy through the piezoelectric film layer. The energy collecting device can effectively utilize the vibration energy caused by the photovoltaic panel and the steel cable and realize the conversion of mechanical energy into electric energy. The energy collecting device has a ring structure, and the vibration in different directions is fully utilized. The structure is simple, easy to mass-produce, has strong practical value and application prospect, and is worth popularizing and using in the industry.

Description

Technical Field

[0001] This application relates to the field of photovoltaic power generation technology, and in particular to an energy harvesting device and a photovoltaic power generation system. Background Technology

[0002] Photovoltaic power generation, as a renewable, green, and clean energy source, has ushered in tremendous development opportunities and has been positioned as a strategic emerging industry by many countries. Currently, photovoltaic (PV) support structures mainly include two types: fixed supports and flexible supports. Compared to fixed supports, flexible supports have advantages such as lower steel consumption, larger spans, stronger terrain adaptability, and higher cost-effectiveness, and have been gradually applied in practical PV power generation projects. However, due to the low frequency and light weight of flexible PV support structures, they are prone to vibration under wind loads. People usually focus more on the suppression of vibration and wind resistance performance of flexible PV support structures, without considering the utilization of these vibrations. Summary of the Invention

[0003] This application provides an energy harvesting device that uses the vibration generated by a flexible photovoltaic support structure under wind load as a vibration source excitation, and a photovoltaic power generation system that uses the energy harvesting device.

[0004] Therefore, according to one aspect of this application, an energy harvesting device is provided for a flexible photovoltaic support, the flexible photovoltaic support including columns and steel cables connected between the columns for mounting photovoltaic panels, the energy harvesting device including a piezoelectric sleeve, a connecting assembly, an active ring magnet and a driven ring magnet;

[0005] The piezoelectric sleeve includes an inner metal layer, a piezoelectric film layer, and an outer metal layer arranged sequentially from the inside to the outside. The piezoelectric sleeve is used to be sleeved on the outside of the steel cable and near the column. There is a gap between the inner wall of the piezoelectric sleeve and the outer wall of the steel cable. The connecting assembly is disposed at the end of the piezoelectric sleeve near the column and is used to fix the piezoelectric sleeve to the column. The active annular magnet is sleeved and fixed on the steel cable inside the piezoelectric sleeve. The driven annular magnet is coaxially fixed on the inner wall of the piezoelectric sleeve. There is a gap in the radial direction between the driven annular magnet and the active annular magnet, and the inner side of the driven annular magnet has the same magnetic pole as the outer side of the active annular magnet.

[0006] Optionally, the piezoelectric thin film layer is a PVDF piezoelectric thin film.

[0007] Optionally, the driven annular magnet is disposed inside the end of the piezoelectric sleeve away from the connecting assembly, and the active annular magnet is sleeved and fixed to the steel cable inside the driven annular magnet.

[0008] Optionally, both the active ring magnet and the driven ring magnet are flexible ring magnets.

[0009] Optionally, the connecting assembly includes a flange and connecting screws, the flange being fixedly connected to one end of the piezoelectric sleeve, and the connecting screws being used to fix the flange to the column.

[0010] Optionally, the side of the flange away from the piezoelectric sleeve is fitted against the outer wall of the column near the steel cable.

[0011] According to another aspect of this application, a photovoltaic power generation system is provided, including a flexible photovoltaic support, a photovoltaic panel, and an energy harvesting device as described above, wherein the photovoltaic panel is mounted on a steel cable of the flexible photovoltaic support, and the energy harvesting device is disposed at the connection between the steel cable and the column of the flexible photovoltaic support.

[0012] Optionally, the photovoltaic power generation system includes an energy storage device and multiple energy collection devices. Each of the connection points between the steel cable and the column of the flexible photovoltaic support is provided with an energy collection device. The piezoelectric thin film layer in each energy collection device is electrically connected to the energy storage device. The energy storage device is used to store the electrical energy collected by each energy collection device.

[0013] Optionally, the photovoltaic power generation system further includes a synthetic jet exciter, a power supply circuit, a controller, and sensors for monitoring wind speed and pressure. The synthetic jet exciter is arranged below the photovoltaic panel, with its nozzle facing the photovoltaic panel. The input of the power supply circuit is electrically connected to the energy harvesting device and the photovoltaic panel, and the output of the power supply circuit is electrically connected to the synthetic jet exciter. The controller is electrically connected to the power supply circuit and the sensors. Under the control of the controller, the synthetic jet exciter sprays airflow onto the photovoltaic panel to suppress vibration of the photovoltaic panel.

[0014] The beneficial effects of the energy harvesting device and photovoltaic power generation system provided in this application are as follows: Compared with the prior art, the energy harvesting device of this application is used to install at the connection between the steel cable and the column of the flexible photovoltaic support. When the environmental wind load acts on the steel cable, the steel cable vibrates, which in turn causes the photovoltaic panel and its support structure to vibrate. The greater the environmental wind load, the more intense the vibration. Conversely, the vibration of the photovoltaic panel and its support structure will cause the steel cable connected to it to vibrate. This repeated process will generate a huge vibration transmission. When the environmental wind load increases further, it will directly have a huge impact on the photovoltaic panel, causing its vibration effect to be further superimposed. At this time, the vibration transmission will be more obvious. When the steel cable vibrates violently, since both ends of the cable are fixed to the posts, the vibration is eventually transmitted to the vicinity of the posts. At this time, the active annular magnet vibrates along with the steel cable. When the active annular magnet vibrates in different directions, the driven annular magnet inside the piezoelectric sleeve in that direction moves closer and generates a repulsive force, causing the piezoelectric thin film layer to deform continuously. The piezoelectric thin film layer converts mechanical energy into electrical energy. An energy storage circuit is connected near the fixed end of the post to store the energy output by the piezoelectric thin film layer, thus completing the vibration energy harvesting. Because the piezoelectric sleeve is fitted on the outside of the steel cable, the driven annular magnet is coaxially fixed to the inner wall of the piezoelectric sleeve, and the active annular magnet is fitted and fixed to the steel cable inside the piezoelectric sleeve, a multi-directional energy harvesting effect can be achieved. This photovoltaic power generation system, by adopting the energy harvesting device of this application, can generate a large amount of additional electrical energy by utilizing the vibration of the steel cable. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] in:

[0017] Figure 1 This is a schematic diagram of the installation structure of an energy harvesting device on a flexible photovoltaic support according to an embodiment of this application;

[0018] Figure 2 yes Figure 1 A schematic diagram of the cross-sectional structure;

[0019] Figure 3 This is a schematic diagram of the structure of a photovoltaic power generation system according to an embodiment of this application;

[0020] Figure 4 This is a cross-sectional schematic diagram of a synthetic jet exciter in a photovoltaic power generation system, as shown in one embodiment of this application.

[0021] Explanation of reference numerals in the attached figures:

[0022] 100. Energy harvesting device; 110. Piezoelectric sleeve; 111. Inner metal layer; 112. Piezoelectric thin film layer; 113. Outer metal layer; 120. Connecting assembly; 121. Flange; 122. Connecting screw; 130. Active ring magnet; 140. Driven ring magnet;

[0023] 200. Energy storage devices;

[0024] 10. Flexible photovoltaic support structure; 11. Column; 12. Steel cable;

[0025] 20. Photovoltaic panels;

[0026] 30. Synthetic jet exciter;

[0027] 40. Power supply circuit;

[0028] 50. Controller;

[0029] 60. Sensors. Detailed Implementation

[0030] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings. Preferred embodiments of this application are shown in the drawings. However, this application can be implemented in many other different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of this application.

[0031] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0032] It should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0034] As described in the background section, flexible photovoltaic (PV) support structures are prone to vibration under wind loads due to their low frequency and light weight. Research has typically focused on suppressing vibration and improving wind resistance, without considering how to utilize this vibration.

[0035] To address the aforementioned problems, according to one aspect of this application, embodiments of this application provide an energy harvesting device, such as... Figures 1-3 As shown, the energy harvesting device 100 is used for a flexible photovoltaic support 10. The flexible photovoltaic support 10 includes columns 11 and steel cables 12 connected between the columns 11 for mounting photovoltaic panels 20. The energy harvesting device 100 includes a piezoelectric sleeve 110, a connecting assembly 120, an active annular magnet 130, and a driven annular magnet 140. The piezoelectric sleeve 110 includes an inner metal layer 111, a piezoelectric thin film layer 112, and an outer metal layer 113 arranged sequentially from the inside to the outside. The piezoelectric sleeve 110 is used to be sleeved on the outside of the steel cable 12 and close to the column 11. There is a gap between the inner wall of the piezoelectric sleeve 110 and the outer wall of the steel cable 12. The connecting assembly 120 is disposed at one end of the piezoelectric sleeve 110 close to the column 11 and is used to fix the piezoelectric sleeve 110 to the column 11. An active annular magnet 130 is sleeved and fixed on a steel cable 12 inside a piezoelectric sleeve 110. A driven annular magnet 140 is coaxially fixed on the inner wall of the piezoelectric sleeve 110. The driven annular magnet 140 and the active annular magnet 130 have a radial gap, and the inner side of the driven annular magnet 140 has the same magnetic pole as the outer side of the active annular magnet 130.

[0036] The inner metal layer 111, the piezoelectric thin film layer 112, and the outer metal layer 113 are tightly bonded together. The inner metal layer 111 and the outer metal layer 113 are thin metal sheets, and the piezoelectric thin film layer 112 is a PVDF piezoelectric thin film composed of polyvinylidene fluoride (PVDF) polymer piezoelectric material. It should be noted that the piezoelectric thin film layer 112 can also use other conventional piezoelectric materials in this field (piezoelectric materials can be divided into three categories: piezoelectric crystals, such as quartz crystals and potassium sodium tartrate; polarized piezoelectric ceramics, which are artificially synthesized polycrystalline materials, such as barium titanate; and organic piezoelectric materials, which are novel piezoelectric materials, such as PVDF). Compared to using piezoelectric ceramics, the PVDF piezoelectric thin film has the quality of withstanding higher external environmental stimuli.

[0037] For the piezoelectric sleeve 110, when vibration energy is transmitted, the inner metal layer 111, the piezoelectric thin film layer 112 and the outer metal layer 113 will deform. At this time, the inner and outer metal layers 113 and the piezoelectric thin film layer 112 are equivalent to capacitors, thereby realizing the conversion of mechanical energy into electrical energy.

[0038] In this embodiment, the energy harvesting device 100 is installed at the connection between the steel cable 12 and the column 11 of the flexible photovoltaic support 10. When the environmental wind load acts on the steel cable 12, the steel cable 12 vibrates, which in turn causes the photovoltaic panel 20 and its support structure to vibrate. The greater the environmental wind load, the more intense the vibration. Conversely, the vibration of the photovoltaic panel 20 and its support structure will cause the steel cable 12 connected to it to vibrate. This repeated process will generate a huge vibration transmission. When the environmental wind load increases further, it will directly have a huge impact on the photovoltaic panel 20, causing its vibration effect to be further superimposed. At this time, the vibration transmission will be more obvious. When the steel cable 12 vibrates violently, since both ends of the steel cable 12 are fixed to the column 11, the vibration will eventually be transmitted to the vicinity of the column 11. At this time, the active annular magnet 130 vibrates together with the steel cable 12. When the active annular magnet 130 vibrates in different directions, the driven annular magnet 140 on the inside of the piezoelectric sleeve 110 in that direction moves closer and generates a repulsive force, causing the piezoelectric thin film layer 112 to continuously deform. The piezoelectric thin film layer 112 converts mechanical energy into electrical energy. An energy storage circuit is connected near the fixed end column 11 to store the energy output by the piezoelectric thin film layer 112, thus completing the vibration energy harvesting. Since the piezoelectric sleeve 110 is sleeved on the outside of the steel cable 12, the driven annular magnet 140 is coaxially fixed to the inner wall of the piezoelectric sleeve 110, and the active annular magnet 130 is sleeved and fixed to the steel cable 12 inside the piezoelectric sleeve 110, the effect of multi-directional energy harvesting can be achieved. Meanwhile, the repulsion between the same poles of the active annular magnet 130 and the driven annular magnet 140 during vibration is more conducive to increasing the deformation and vibration amplitude of the piezoelectric sleeve 110.

[0039] Overall, the energy harvesting device 100 can effectively utilize the vibration energy caused by the photovoltaic panel and the steel cable 12 and realize the conversion of mechanical energy into electrical energy. Furthermore, the energy harvesting device 100 has a circumferential structure, which makes full use of vibrations in different directions. It also has a simple structure, is easy to mass-produce, and has strong practical value and application prospects. It is worth promoting and using in the industry.

[0040] In one embodiment, such as Figure 2 As shown, the driven annular magnet 140 is disposed on the inner side of the piezoelectric sleeve 110 away from the connecting assembly 120, and the active annular magnet 130 is sleeved and fixed on the steel cable 12 inside the driven annular magnet 140.

[0041] After the steel cable 12 vibrates, the side wall of the piezoelectric sleeve 110 deforms under the combined action of gravity and repulsive force of the driven annular magnet 140, generating voltage output. By placing the driven annular magnet 140 at the end of the piezoelectric sleeve 110 away from the connecting assembly 120, the vibration and bending amplitude of the piezoelectric sleeve 110 are increased.

[0042] Preferably, both the active annular magnet 130 and the driven annular magnet 140 are flexible annular magnets made of soft magnetic materials, which do not affect the bending deformation of the steel cable 12 and the piezoelectric sleeve 110.

[0043] In one embodiment, such as Figures 1-2 As shown, the connecting assembly 120 includes a flange 121 and a connecting screw 122. The flange 121 is fixedly connected to one end of the piezoelectric sleeve 110, and the connecting screw 122 is used to fix the flange 121 to the column 11.

[0044] Furthermore, the side of flange 121 facing away from piezoelectric sleeve 110 is fitted against the outer wall of column 11 near steel cable 12. Specifically, when the outer wall of column 11 near steel cable 12 is flat, the side of flange 121 facing away from piezoelectric sleeve 110 is flat; when the outer wall of column 11 near steel cable 12 is a flat arc surface, the side of flange 121 facing away from piezoelectric sleeve 110 is arc surface. This design increases the contact area between flange 121 and column 11, thereby improving the connection's strength.

[0045] According to another aspect of this application, embodiments of this application also provide a photovoltaic power generation system, such as... Figure 3 As shown, the photovoltaic power generation system includes a flexible photovoltaic support 10, a photovoltaic panel 20, and an energy harvesting device 100 in any of the above embodiments. The photovoltaic panel 20 is mounted on the steel cable 12 of the flexible photovoltaic support 10, and the energy harvesting device 100 is located at the connection between the steel cable 12 and the column 11 of the flexible photovoltaic support 10.

[0046] When environmental wind loads act on the steel cable 12, the cable 12 vibrates, which in turn causes the photovoltaic panel 20 and its support structure to vibrate. The greater the environmental wind load, the more intense the vibration. Conversely, the vibration of the photovoltaic panel 20 and its support structure causes the steel cable 12 connected to it to vibrate, and this cycle repeats, resulting in significant vibration transmission. When the environmental wind load further increases, it directly has a significant impact on the photovoltaic panel 20, causing its vibration effect to be further amplified, making the vibration transmission even more pronounced. This photovoltaic power generation system, by employing the energy harvesting device 100 in the above embodiment, can generate electricity using the vibration of the flexible photovoltaic support 10.

[0047] Furthermore, the photovoltaic power generation system includes an energy storage device 200 and multiple energy harvesting devices 100. An energy harvesting device 100 is installed at the connection between the steel cable 12 of the flexible photovoltaic support 10 and each column 11. The piezoelectric thin film layer 112 in each energy harvesting device 100 is electrically connected to the energy storage device 200. The energy storage device 200 is used to store the electrical energy collected by each energy harvesting device 100. The energy storage device 200 can be a capacitor, battery, or other storage device.

[0048] According to the theory of vibration dynamics, within a certain range, the output voltage of a piezoelectric material increases with the increase of the amplitude of the end vibration. When the vibration frequency is close to the natural frequency of the system, resonance occurs, at which point the output of the energy harvesting device 100 reaches its peak. Therefore, when installing the energy harvesting device 100 of this application, relevant data such as the local annual average wind pressure and monthly average wind pressure should be fully investigated to obtain the frequency at which the structure theoretically vibrates, and then the device should be selected reasonably to achieve the optimal effect.

[0049] In one embodiment, such as Figures 3-4 As shown, the photovoltaic power generation system also includes a synthetic jet exciter 30, a power supply circuit 40, a controller 50, and a sensor 60 for monitoring wind speed and pressure. The synthetic jet exciter 30 is arranged below the photovoltaic panel 20, with its nozzle facing the photovoltaic panel 20. The input of the power supply circuit 40 is electrically connected to the energy harvesting device 100 and the photovoltaic panel 20, and the output of the power supply circuit 40 is electrically connected to the synthetic jet exciter 30. The controller 50 is electrically connected to the power supply circuit 40 and the sensor 60. Under the control of the controller 50, the synthetic jet exciter 30 sprays airflow onto the photovoltaic panel 20 to suppress the vibration of the photovoltaic panel 20.

[0050] Based on the energy collected by the energy harvesting device 100, a synthetic jet exciter 30 installed below the flexible photovoltaic panel 20 can suppress vibration. It should be noted that the intensity of the jet flow depends on the control effect achieved in flow separation; it is not a constant value under different environments. The goal is simply for the jet to achieve controlled flow separation and thus suppress vibration.

[0051] like Figure 4 As shown, the synthetic jet exciter 30 is manufactured using MEMS technology. It features a low, rectangular cavity, integrally formed on a silicon-based material using an etching method. The cavity's bottom surface measures 75mm × 75mm. A narrow slit, measuring 75mm × 0.5mm, is formed on the upper surface of the cavity. The bottom surface of the cavity is sealed with a polyimide film containing added metal components, and a circular piezoelectric ceramic sheet is integrated onto the outer surface.

[0052] Principle: When the synthetic jet exciter 30 is working, the piezoelectric ceramic undergoes the inverse piezoelectric effect under the action of a periodically changing voltage signal. The flexible thin film on the bottom surface of the cavity then vibrates periodically, converting the input electrical energy into the kinetic energy of the film vibration, thereby generating an unsteady jet at the narrow slit of the exciter opening. When the film vibrates along the -x direction, the cavity pressure decreases, and nearby gas enters the cavity through the opening. When the film vibrates along the +x direction, the cavity pressure increases, and the gas in the cavity is discharged from the cavity through the outlet slit. During this alternating blowing and suction process, the airflow near the opening slit is subjected to strong shearing, resulting in flow separation at the outlet edge. This separation causes the discharged fluid to rise and form vortex pairs. When entering the next suction process, the vortex pairs formed in the previous blowing process and moving downstream have already moved away from the vicinity of the outlet and are therefore unaffected by the suction. In the continuous alternating blowing and suction process, a series of vortex pairs migrate downstream. Once formed, vortices migrate downstream at a self-induced velocity. During this migration, the energy of the vortex pairs is continuously consumed, their coherent structure gradually disappears, and the vortex pairs become blurred, eventually evolving into scattered turbulent flow until they merge with the surrounding gas. Periodic thin-film vibrations continuously generate vortex pairs and repeat the development and evolution process of vortex pairs, thus forming a synthetic jet.

[0053] The synthetic jet exciter 30 utilizes the air near the flexible photovoltaic panel 20 to allow airflow to enter the synthetic jet exciter 30. The synthetic jet exciter 30 includes a front hole and an upper hole. It absorbs low-speed gas from the windward front or the upper hole through the front hole and then ejects it from the upper hole in a direction perpendicular to the photovoltaic panel 20.

[0054] The electrical energy generated by the energy harvesting device 100 is used to operate through an external circuit and a sensor 60, forming an organic combination of energy harvesting and vibration suppression.

[0055] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0056] The above embodiments are merely illustrative of several implementation methods of this application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. An energy harvesting device for a flexible photovoltaic support, the flexible photovoltaic support comprising columns and steel cables connected between the columns for mounting photovoltaic panels, characterized in that, The energy harvesting device includes a piezoelectric sleeve, a connecting assembly, an active ring magnet, and a driven ring magnet; The piezoelectric sleeve includes an inner metal layer, a piezoelectric film layer, and an outer metal layer arranged sequentially from the inside to the outside. The piezoelectric sleeve is used to be sleeved on the outside of the steel cable and near the column. There is a gap between the inner wall of the piezoelectric sleeve and the outer wall of the steel cable. The connecting assembly is disposed at the end of the piezoelectric sleeve near the column and is used to fix the piezoelectric sleeve to the column. The active annular magnet is sleeved and fixed on the steel cable inside the piezoelectric sleeve. The driven annular magnet is coaxially fixed on the inner wall of the piezoelectric sleeve. There is a gap in the radial direction between the driven annular magnet and the active annular magnet, and the inner side of the driven annular magnet has the same magnetic pole as the outer side of the active annular magnet.

2. The energy harvesting device according to claim 1, characterized in that, The piezoelectric thin film layer is a PVDF piezoelectric thin film.

3. The energy harvesting device according to claim 1, characterized in that, The driven annular magnet is disposed on the inner side of the piezoelectric sleeve at the end away from the connecting assembly, and the active annular magnet is sleeved and fixed on the steel cable inside the driven annular magnet.

4. The energy harvesting device according to claim 1, characterized in that, Both the active ring magnet and the driven ring magnet are flexible ring magnets.

5. The energy harvesting device according to claim 1, characterized in that, The connecting assembly includes a flange and connecting screws. The flange is fixedly connected to one end of the piezoelectric sleeve, and the connecting screws are used to fix the flange to the column.

6. The energy harvesting device according to claim 5, characterized in that, The side of the flange away from the piezoelectric sleeve is attached to the outer wall of the column near the steel cable.

7. A photovoltaic power generation system, characterized in that, The invention includes a flexible photovoltaic support structure, a photovoltaic panel, and an energy harvesting device as described in any one of claims 1-6, wherein the photovoltaic panel is mounted on a steel cable of the flexible photovoltaic support structure, and the energy harvesting device is disposed at the connection between the steel cable and the column of the flexible photovoltaic support structure.

8. The photovoltaic power generation system according to claim 7, characterized in that, The photovoltaic power generation system includes an energy storage device and multiple energy collection devices. Each of the connection points between the steel cable and the column of the flexible photovoltaic support is provided with an energy collection device. The piezoelectric thin film layer in each energy collection device is electrically connected to the energy storage device. The energy storage device is used to store the electrical energy collected by each energy collection device.

9. The photovoltaic power generation system according to claim 8, characterized in that, The photovoltaic power generation system also includes a synthetic jet exciter, a power supply circuit, a controller, and sensors for monitoring wind speed and pressure. The synthetic jet exciter is arranged below the photovoltaic panel, with its nozzle facing the photovoltaic panel. The input of the power supply circuit is electrically connected to the energy harvesting device and the photovoltaic panel, and the output of the power supply circuit is electrically connected to the synthetic jet exciter. The controller is electrically connected to the power supply circuit and the sensors. Under the control of the controller, the synthetic jet exciter sprays airflow onto the photovoltaic panel to suppress vibration of the photovoltaic panel.

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